How about a little love for DnD Next? I think Rangers should be able to get a faithful friend, lets see what we can do
Fighting Style Ranger Second Level
You choose a natural beast monster (pending DM approval and environmental considerations) of your level or lower. This is now your faithful companion. It moves as part of your move, but you must use your action to cause the beast to attack. Using your reaction, any creature that attacks another target while engaged with your beast companion gains disadvantage for that attack.